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Accounts of Chemical Research     Full-text available via subscription   (Followers: 144)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 28)
Analytica Chimica Acta     Hybrid Journal   (Followers: 32)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 29)
Analytical Chemistry     Full-text available via subscription   (Followers: 244)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 3)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 6)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 4)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 6)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 16)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 4)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 20)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover   Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [16 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2276 journals]
  • Possibilities of liquid chromatography for the assessment of the
           composition of polymethylene naphthalene sulfonates
    • Abstract: Abstract A method for assessing the composition of polymethylene naphthalene sulfonates is proposed based on reversed-phase liquid chromatography with gradient elution. The optimal ranges of the parameters of the molecular-weight distribution of polymethylene naphthalene sulfonates are found.
      PubDate: 2015-12-01
  • Suspension columns with grain sorbents retained in an ultrasonic field for
           separation and determination of rare-earth elements in wines
    • Abstract: Abstract The properties of a Diasorb-130-IDK sorbent based on silica gel with a grain size of about 6 µm were studied in order to choose conditions for the separation of the rare-earth elements from the samples of natural wine and their subsequent determination by inductively coupled plasma mass spectrometry. The possibility of the quantitative separation of the elements with the use of an ultrasonic flow suspension column was demonstrated. The results were compared with data obtained with the use of other sample preparation methods. A procedure was proposed for the determination of the rare-earth elements and yttrium in the samples of wines.
      PubDate: 2015-12-01
  • Chronoamperometric determination of synthetic phenolic antioxidants in
           Brij® 35 micellar medium
    • Abstract: Abstract tert-Butylhydroquinone (TBHQ) and tert-butylhydroxyanisole (BHA) are oxidized on a glassy carbon electrode modified with multiwalled carbon nanotubes in a 0.1 M LiClO4 supporting electrolyte in the medium of 1 mM Brij®35 at 0.27 and 0.47 V, respectively. A method for their chronoamperometric determination is developed. It is shown that a steady-state electrolysis is achieved within 100 s. The analytical range is 2.50–1000 µM for TBHQ and 1.50–100 and 250–1000 µM for BHA with the detection limits (S/N = 3) 0.64 and 0.38 µM, respectively. The relative standard deviation in the determination of TBHQ and BHA in model solutions does not exceed 6%. The method was tested on micellar extracts of linseed oils. The accuracy measure is 100 ± 1%, which points to the absence of matrix effects in the determination of TBHQ and BHA.
      PubDate: 2015-12-01
  • Preconcentration of elements as hydrophobic complexes with low-polar
    • Abstract: Abstract Data on the adsorption preconcentration of elements as hydrophobic complexes on nonpolar and low-polar adsorbents are reviewed and systematized. It is shown that inorganic (most often octadecyl silica), organic polymer (polytetrafluoroethylene and its analogues, styrene–divinylbenzene copolymers, polyurethane, cellulose), and carbon matrices (activated carbon, expanded graphite, fullerenes) are used for the extraction of elements in such systems. The “flexibility” of such preconcentration systems is demonstrated: impregnated and adsorption-modified adsorbents can be obtained, elements can be extracted as pre-synthesized synthesized hydrophobic complexes, and the desorption of elements can be performed with the destruction of such complexes or without it. It is shown that the large number of similar preconcentration systems enable the creation of effective configurations of hybrid and combined systems for analyzing various samples.
      PubDate: 2015-12-01
  • Chromatographic determination of C 70 fullerene in animal organs and
    • Abstract: Abstract A method has been developed for the determination of C70 fullerene in animal organs and tissues using reversed-phase high-performance liquid chromatography with ultraviolet detection combined with sample preparation consisting in the homogenization of samples, treatment of the homogenates with acetic acid, and extraction of fullerene with toluene. The recovery of C70 fullerene from various organs was ~89–93%, the limit of detection is 75 ng/mL.
      PubDate: 2015-12-01
  • Modifing ASTM standard method by using homogeneous liquid-liquid
           microextraction combined with fiber optic UV-vis spectrometery for a
           greener approach to determination of total phenols in water
    • Abstract: Abstract New developed method based on official American Society for Testing and Materials (ASTM) standard method was used for determining phenolic compounds in water by using homogeneous liquid–liquid extraction (HLLE) and fiber optic-linear array detection spectrometers (FOLADS). HLLE is a method based on phase separation in a ternary solvent system (water-tetrabutylammonium ion, TBA +-chloroform). The phase separation phenomenon occurred by an ion-pair formation of TBA + and perchlorate ion. The aim of using this method was decreasing volume of extraction solvent used in ASTM standard method. After centrifugation the sediment phase was transferred to a 50-μL cylindrical micro-cell and absorbance was measured at 480 nm. Under the optimum conditions, linearity was obtained in the range of 5.0 to 80.0 μg/L for phenol. Coefficient of correlation (r 2) was 0.992. The relative standard deviation was 1% for the analysis of 5 samples with concentration of 50 μg/L of phenol. The limit of detection was 2.0 μg/L. The relative recoveries of phenol in water samples were in the range of 97–104%. The proposed method was successfully applied for determination of phenolic compounds in real water samples.
      PubDate: 2015-12-01
  • Liquid chromatography-tandem mass spectrometry method development and
           validation for the determination of erlotinib in human plasma and its
           application in pharmacokinetic study
    • Abstract: Abstract A simple, rapid, specific and precise liquid chromatography–tandem mass spectrophotometric (LC-MS/MS) method was developed and validated for quantification of Erlotinib, in human plasma. Erlotinib d6 was used as internal standard, added to plasma sample prior to extraction using acetonitrile as a precipitating agent. Chromatographic separation was achieved on Phenomenex Luna C18 column (50 mm × 1 mm, 5 μm) with acteonitrile: 10 mM ammonium formate buffer (80: 20, v/v) as an isocratic mobile phase with a flow rate of 0.5 mL/min. Quantitation was performed by transition of 394.0 → 278.0 (m/z) for Erlotinib and 400.0 → 278.0 (m/z) for Erlotinib d6. The lower limit of quantitation was 10 ng/mL with a 100 mL plasma sample. The concentrations of nine working standards showed linearity between 10 and 5000 ng/mL (r 2 ≥ 0.9992). Chromatographic separation was achieved within 3.50 min. The average extraction recoveries of 3 quality control concentrations were 94.25% for Erlotinib and 93.55% for Erlotinib d6. The coefficient of variation was ≤15% for intraand inter-batch assays. The developed method was successfully applied to the determination of Erlotinib pharmacokinetics after oral administration.
      PubDate: 2015-12-01
  • Methods for the extraction of biologically active substances from
           medicinal plants based on an example of St. John’s wort components
    • Abstract: Abstract The efficiency of extraction of biologically active substances from common St. John’s wort (Hypericum perforatum L.) under varied conditions was compared in order to optimize a sample preparation procedure. The extraction with water and water–alcohol solutions under static conditions and with stirring was examined; the effect of ultrasonic treatment and extraction with water and water–alcohol mixtures under dynamic conditions at elevated temperature and pressure and the extraction with supercritical carbon dioxide were studied. It was established that, in the extraction of biologically active substances from plant materials, the chemical affinity of an extractant the extracted component is of primary importance; an increase in the pressure under dynamic conditions is the second factor in importance, which increases the efficiency of extraction.
      PubDate: 2015-12-01
  • Dispersive liquid-liquid microextraction based on task-specific ionic
           liquids for determination and speciation of chromium in human blood
    • Abstract: Abstract In this study, a simple dispersive liquid-liquid microextraction method based on task-specific ionic liquids was applied for highly sensitive determination and speciation of chromium (III, VI) in human blood by electro-thermal atomic absorption spectrometry. In this method, a mixture containing of 1-(3-aminopropyl)-3-methylimidazolium hexafluorophosphate [APMIM][PF 6] and 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF 4] (extracting solvent), acetone (dispersant) and TX-100 (anti-sticking agent) were added to Cr(VI) solution in 1 mL blood samples that was extracted by binary mix ionic liquids. For extraction of Cr(VI) anions, the binary mix ionic liquids ([APMIM][PF 6], [BMIM][BF 4]) and acetone were used as extracting and dispersant solvent, respectively. Total chromium was simply obtained by oxidation of Cr(III) to Cr(VI) by H2O2 solution, and Cr(III) is calculated by difference between total chromium and Cr(VI). Under the optimal conditions, the calibration graph and limit of detection were 0.02–0.9 µg/L and 5 ng/L, respectively. The developed method was applied successfully to determination and speciation Cr (III, VI) in human blood samples.
      PubDate: 2015-12-01
  • Simultaneous determination of the elemental composition and ash content of
           carbon materials by total reflection X-ray fluorescence
    • Abstract: Abstract Modern methods for the determination of the elemental composition and ash content of carbon materials are considered. The use of total reflection X-ray fluorescence analysis (TXRF) for the simultaneous determination of the elemental composition and ash content of carbon materials on quartz reflectors is proposed. The results of quantitative analysis are compared with the results obtained by certified procedures of inductively coupled plasma atomic emission spectrometry and gravimetry. Prospects for the use of TXRF in the analysis of samples of the metallurgical industry are discussed.
      PubDate: 2015-12-01
  • Complexation of titanium(IV) malonates with phenylfluorone and
           2,7-dichlorochromotropic acid on a solid phase of PANV-AV-17
    • Abstract: Abstract Complexation of titanium(IV) with 2,7-dichlorochromotropic acid and phenylfluorone is studied by diffuse reflection spectroscopy after the adsorption of titanium complexes with organic acids on a polyacrylonitrile fiber filled with an AV-17 anion exchanger. The dependence of the analytical signal on the conditions of adsorption in the dynamic mode is studied, namely, on the nature and concentration of the organic acid, pH of the initial solution, concentration of titanium, and presence of foreign ions. Based on a comparison of the analytical characteristics of complexation reactions, the following system was selected for the determination of 0.01–0.05 µg/mL of titanium in drinking water: adsorption from a 2 × 10–3 M solution of malonic acid with pH 3.5–4, reaction with phenylfluorone in the solid phase, and spectroscopic signal recording at 600 nm or visual detection using a color scale. It was shown that phenylfluorone is superior to 2,7-dichlorochromotropic acid both in sensitivity and selectivity of titanium determination after adsorption on the solid phase of PANV-AV-17 as titanium malonate complexes.
      PubDate: 2015-12-01
  • An improved high performance liquid chromatography method for the
           separation of carotenoids extracted from Phaffia rhodozyma
    • Abstract: Abstract Separation of analytes is an important factor affecting the effectiveness of carotenoids analysis from a complex extraction. In this study, a high performance liquid chromatography procedure with improved separation was developed to determine carotenoids extracted from P. rhodozyma. Mixture design experiment was employed to optimize the organic solvent constitution, which showed that the optimal organic phase was composed (v/v) of 61% of methanol, 32% of tetrahydrofuran, and 7% of acetonitrile. Furthermore, the gradient elution procedure optimization demonstrated that the gradient elution started at the optimal organic phase concentration of 60% lead to the best separation effect. Meanwhile, 18 compounds in total 25 detected peaks were separated. Based on their absorption spectra, astaxanthin, ß-carotene, zeaxanthin, β-cryptoxanthin and lycopene were identified by matching their retention times with standards. Interestingly, our improved HPLC method was effective to classify P. rhodozyma strains and monitor the degradation of astaxanthin in accordance with their carotenoids composition.
      PubDate: 2015-12-01
  • A microplasma analyzer for the determination of alkali and alkaline-earth
           metals in small volumes of samples of complex phase composition
    • Abstract: Abstract A microplasma analyzer is developed for the determination of potassium, lithium, calcium, and magnesium in small volumes of samples of complex phase composition on an example of putrefactive lymphocytic wound exudates and articular and amniotic fluids. The operation of the device is based on a drop spark discharge between liquid electrodes, one of which is a drop of a studied solution applied onto the cathode. This scheme allows the reduction of sample volume for a single determination to 15 µL.
      PubDate: 2015-12-01
  • Application of low density miniaturized dispersive liquid-liquid
           extraction method for determination of formaldehyde in aqueous samples
           (water, fruit juice and streptococcus vaccine) by HPLC-UV
    • Abstract: Abstract A simple method based on miniaturized dispersive liquid–liquid extraction is reported for extraction and preconcentration of formaldehyde in water samples. Eight milliliters of an aqueous sample containing 2,4-dinitrophenylhydrazine were added to a 10.0 mL volumetic flask containing 1.0 mL of methanol–butyl acetate (2: 1) mixture. After phase separation the analyte was determined by HPLC-UV. No clean-up or evaporation were required after extraction. Several factors influencing the extraction efficiency, such as the type and volume of organic solvent, type and volume of co-solvent, pH of the sample solution, ionic strength, and extraction time were evaluated and optimized. Under optimal experimental conditions, good linearity was obtained in the range of 1.5 × 10–4–10 µg/mL (r = 0.996), and the limit of detection was 5 × 10–5 µg/mL. The method produced 20-fold enrichment of the formaldehyde. The average recovery of spiked formaldehyde in real samples was in the range of 90–110% with RSD in the range of 3–8%.
      PubDate: 2015-12-01
  • A colorimetric sensor based on a polymethacrylate matrix with immobilized
           1-(2-pyridylazo)-2-naphthol for the determination of cobalt
    • Abstract: Abstract A colorimetric sensor is proposed for the determination of cobalt. It is prepared by immobilizing 1-(2-pyridylazo)-2-naphthol (PAN) in an optically transparent polymethacrylate matrix. The conditions for determining cobalt by the proposed colorimetric sensor are found in the study of the complexation of cobalt with a PAN-modified polymethacrylate matrix. The determination is based on the interaction of the sensor with a cobalt solution at pH 4 for 5 min, followed by the measurement of absorbance at 620 nm. The sensor ensures the determination of 0.05–0.50 mg/L of cobalt with the detection limit 0.03 mg/L. It is demonstrated that the sensor can be used for the determination of cobalt in the Cyanocobalamin medical preparation and potable water.
      PubDate: 2015-12-01
  • High-performance liquid chromatography–high-resolution
           time-of-flight mass spectrometry in the identification and determination
           of penicillin and tetracycline group antibiotics in food
    • Abstract: Abstract A method of the identification and determination of 27 antibiotics of penicillin (15) and tetracycline (12) groups in food using high-resolution time-of-flight mass spectrometry combined with high-performance liquid chromatography and a simple and fast sample preparation procedure have been developed. The analytical range for penicillins is 3 (50)–300 (1000) μg/kg and for tetracyclines, 0.3 (1.5)–100 (200) μg/kg. A scheme of the identification and determination of antibiotics using the standard addition method has been proposed. The relative standard deviation of the results of analysis does not exceed 10%. The time of sample screening is 30–40 min, the time of the determination of the detected antibiotics is 2–3 h.
      PubDate: 2015-11-01
  • Determination of tramadol hydrochloride in water samples by directly
           suspended droplet three-phase liquid phase microextraction with
    • Abstract: Abstract Suspended droplet three-phase liquid microextraction is a relatively new sample preparation technique for analysis of drugs. In the current study, tramadol hydrochloride was determined using tetrathiocyanato cobalt(II), (NH4)2[Co(SCN)4], as the complexing agent. The maximum of absorption for the formed ternary complex between tramadol hydrochloride and tetrathiocyanato cobalt(II) was observed at 625 nm. In this method, the target compound was extracted from the aqueous phase (5 mL containing 5 μg/mL of sample, pH 11) into an organic phase and then back-extracted into a directly suspended droplet as acceptor phase (3 μL of 1.74 × 10–9 M tetrathiocyanato cobalt(II), pH 2.8). 1-Octanol was used as organic phase. Under the optimized conditions: extraction time 90 s, back-extraction time 8 min and stirring rate 750 rpm, the linear range, the relative standard deviation (RSD, n = 5) and the limit of detection for tramadol hydrochloride were found 0.5–8 μg/mL, 4.9% and 8 ng/mL (n = 5), respectively. Also, the tap water and surface water samples were successfully analyzed using the proposed method and the relative recoveries obtained from the spiked water samples were 98.2 and 97.6%, respectively.
      PubDate: 2015-11-01
  • Polyelectrolyte microcapsules with urease and paramagnetic particles as a
           basis for a potentiometric biosensor for determining urea
    • Abstract: Abstract A biosensor is proposed based on a pH-sensitive field-effect transistor for detecting urea. The bioreceptors are polyelectrolyte microcapsules (size of 3–4 μm) with encapsulated paramagnetic particles of Fe3O4 and enzyme urease, capable of biotransforming urea. The bioreceptor was formed on the surface of a transistor gate using a constant magnetic field; the sedimentation of microcapsules in the gate zone proceeded because of the presence of paramagnetic particles in the bioreceptor. The microcapsules were prepared separately and stored at 4°C. This method of biosensor formation took several seconds and did not require additional chemical reagents for treating the electrode surface before and after the measurement. The lower limit of the detection of urea was 0.03 mM in the range of 0.03–100 mM. The biosensor is characterized by high sensitivity (~3.58 pH/mM) and time of signal formation of about 30–150 s, depending on the concentration of urea. The biosensor was tested on milk samples.
      PubDate: 2015-11-01
  • About a correlation between the limits of detection and determination in
           X-ray fluorescence analysis
    • Abstract: Abstract The limit of determination is estimated using different approaches. In one of them it is believed that the limits of detection and determination fundamentally correlate with each other and the limit of determination can be found via the limit detection by multiplying the latter by different coefficients, the choice of which is in some cases insufficiently well substantiated. In this work, a correlation between the limits of determination and detection is studied based on experimental data of the X-ray fluorescence analysis of mineral substances for the major and trace components. We found no functional dependence between the studied values; therefore, the results obtained in the above approach to estimation of the limit of determination are ambiguous.
      PubDate: 2015-11-01
  • Determination and speciation of Se(IV), Se(VI), and selenomethionine in
           iranian walnut samples by spectrophotometry after cloud point extraction
    • Abstract: Abstract A sensitive and selective micelle-mediated speciation and preconcentration method has been developed for trace amount of inorganic and organic selenium prior to UV-Vis spectrophotometry determination. The method is based on cloud point extraction of Se(IV) ions with polyethylene glycol tert-octylphenyl ether (Triton X-114) in presence of 2,3-diaminonaphthalene (DAN) as a chelating agent. Se(IV) ions react with DAN in a surfactant solution yielding a hydrophobic complex at pH 3. The phase separation was accelerated by a 20 min centrifugation at 3500 rpm. The calibration graph obtained from Se(IV)-DAN complexes was linear in the concentration range of 5.0–400.0 ng/mL and detection limit was 9 ng/mL. The relative standard deviation was 1.6% in the determination of 80 ng/mL Se(IV). The proposed method was successfully applied to the speciation and determination of selenium species-Se(IV), Se(VI), selenomethionine—in walnut samples with satisfactory results.
      PubDate: 2015-11-01
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